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DAVID C. GREEN,-OF MILWAUKEE, WISCONSIN.

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SPECIFICATION forming part of Letters Patent No. 514,456, dated February 13, 1894.

Application tiled May 12, 1893. Serial No. 473,931. (No model.)

To @ZZ whom t may concern:

Beit known that I, DAVID C. GREEN, a cit-izenl of the United States, and a resident of Milwaukee, in the countyof Milwaukee, and

in the State of Wisconsin, have invented certain new and useful Improvements in Ovens or Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in the construction of ovens or furnaces and relates more particularly to that class of ovens or furnaces designed for baking cores.

In the accompanying drawings illustrating my inventionz-Figure l is a perspective view of an oven or furnace constructed according to my invention. Fig. 2 is a front elevation of the same. same. Fig. 4 is a vertical longitudinal sectional View of the saine taken on line tw-e of Fig. 3. Fig. 5 is asimilar view taken on line 5-5 of Fig. 3. Fig. 6 is a vertical cross seo- `tional view taken on line 6--6 of Fig. 5. Fig. 7 is a horizontal sectional View taken on line 7-7 ofFig. 5. Fig. 8 is a vertical transverse sectional view illustrating a somewhat dilerent form of construction.

` at diierent elevations so as to form a series of' tracks one above another.

As shown in the drawings, I iind it convenient to construct the oven of suflicient width to permit two series of such tracks to be located therein with an open space A between them, and in this construction, suitable standards B B are erected along the sides of the central space or passage A', and to these standards, suitable rails B2 Biere secured.

As shown more particularly in Figs. l, 2 and 4, I provide doors C C in the front wall of the oven,`which are `hinged to transverse strips c c and arranged to close the spaces be- `tween the tracks. f

Gutside of the front Wallet the oven,-I provide suitable standards D D, to which cross- Fig. 3 is a rear elevation of the.

be baked and run into the oven, and by simply opening the properdoors other loaded trucks may be introduced from time to time, as desired, or any desired truck removed, without the necessity of disturbing any of the other trucks or the articles upon them, and Without the necessity of the attendant entering the oven. v

I ind it convenient to locate the furnace proper, or combustion chamber in the space A between the two tiers of tracks, and to this end I arrange a suitable tire pot F provided With the usual gratef and communicating with the outside air by a suitable inlet Hue f controlled by a regulator F', and also provide a door F2 lin the front Wall of the structure by which the attendant may obtain access to the tire pot to attend to the fire.

At theback of the oven, I provide a suitable uptake tlue or chimney G, which has draft openings g and g leading respectively from the upper and the lower portions of the central space or passage A. Similar openings I-I H and II H are provided in the upper and the lower portions respectively of the side Walls A A, and are arranged to communicate'with suitable external, vertically disposed pipes or conduits I I, which lead to and communicate with the uptake due or chimney G as shown at t'.

Suitable dempers or covers J J are provided for controlling the apertures g g and H H', one of these dampers being arranged opposite to each of said apertures and secured to the inner end of a sliding rod j which projects through the tlue to the out-side of the structure, and is provided with a suitable handle j. Bythis construction, the attendant may close any desired one or more of said aperopen.

or may be evenly distributed throughout theV oven, so as to cause the said currents of heated air to come into contact with the articles upon any desired one or more of-'the trucks.

As a further and separate improvement, I provide a suitable door K at the rear of the oven, and arrange a track L to extend through said door to the rear of the furnace.

As shown in Figs. l and 2 of the drawings, the doors C C in the front Wall of the oven, are Vmade of different sizes, and the spaces between the tracks for the carriages or'trucks vary correspondingly, so as to enable cores of various shapes and sizes to be placed upon the said trucks, and introduced into the oven, While by means of the larger door K, at the rear end of the oven, cores may be run in upon a truck mounted'upon the track L,

which could not be passed through any of the smaller doors inthe front Wall of the structure. sired height, up to the full height of the oven, may be introduced throughV the large door K, anyone or more of the carriages or trucks which would interfere With the introduction of the large cores, being run out upon the tracks in front of the oven.

In the first seven figures of the drawings, I have shown the Walls of the ovens as constructed of mason-Work, and the oven arranged as a permanent structure, While in Fig. S, I have shown the oven walls as constructed from sheet metal, and the device ar ranged to be transported from place to place Without destroying the Walls. In thislatter form also, is shown a heating stove M located Within lthe oven instead of the fire pot F, shown in the other form of construction.

In the construction of core ovens heretofore made which admit of a continuous baking operation, no provision has been made for baking cores above a certain specified limit of size, and such structures are designed chiey for use in baking small cores, While by myimprovement, cores of any desired size from 'the very smallest, n p to the extreme limit of the length and height of the oven may be baked at one and the same time. With the ordinary construction of such furnaces or ovens it is impracticable to bake and remove the smaller cores While large sized cores are being baked, from the fact that the oven must be sufficiently cooled for the attendant to enter before any of the cores can 4be removed, and it has been common to prepare as many cores as the oven will accommodate and to place them all in the oven at one time, and

By this arrangement cores of any de-k -and allowed to burn all night and then allowed to die out and the oven permitted to cool in the morning, when the cores are removed.V

Vith my improved construction however, the

operation of baking the coresmay be carried l on continuously, inasmuch as by simply opening the proper door, a truck loaded with fresh cores, may be run into the oven Without disturbing those already Vin process of baking, or a truck loaded with baked cores may be removed and the truck refilled with fresh cores. In this manner, small cores which take a comparatively short time to bake may be rapidly baked and removed, While the operation of baking large cores is continuously progressing. By niyimprovement therefore,I am enabled to perform aV much greater amount of Work than is possible with core ovens of the ordinary construction from the fact that, With my improved oven, there Vis no loss of time due to letting the oven cool off in order to remove the baked cores and refill it With unbaked cores. YBy my improvement therefore, I am also enabled to effect a great saving in fuel, in proportion to the amount of Workdone from the fact that lrhe oven being kept continuously heated, less fuel is required to Y maintain the desired temperature than if the oven were alternately heated and then permitted to cool.

A further advantage gained by my improved construction is that by reason of the continuous operation of the oven, more work may be done in an oven of a given size than would be possible in an oven of the ordinary form, and by reason of the extreme compactness of the structure muchV less fuel is required to heat itthan would be necessary to heat one of the ordinary forni having an equal capacity.

A still further advantage gained by my construction is, that by the arrangement of the tracks for the reception of the carriages or trucks, one above another, l am enabled toutilize all of the available space Within the oven for the baking of cores.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is l y l. An oven comprisinga suitable chamber, tracks arranged in tiers adjacent to opposite sides of said chamber and extending through openings in the front wall of the chamber, suitable means for heating said chamber, an uptake fine, independent draft apertures in the side Walls communicating with said flue and suitable means for closing any desired one or more of said apertures, substantially as set forth. A

2. An oven comprising a suitable chamber, tracks arranged in tiers adjacent to opposite sides of said chamber and extending through openings in the front Wall of the chamber, a heater located Within the chamber between said tiers of tracks, suitable means for heat- IOO ing said chamber, an uptake flue, independin the county of Milwaukee and State of Wisent draft apertures in the side wallscomxnucousin, in the presence of two witnesses. nicating with said flue and suitable means for closing any desired one or more of said 5 apertures, substantially as set forth. Witnesses:

' In testimony that I claim the foregoing I JOHN E. WILES, have hereunto set my hand, at Milwaukee, N. E. OLIPHAN'I.

DAVID C. GREEN. 

